300x=280*（159+1）x
    （400+x）^2＝105^2+（400-x）^2
     1/6x+1/12x+1/7x+9=2x
    x=1/6+1/12+1/7+9
    x=5/6+6/7+11/12+9
    x=5/6x+6/7x+11/12x+9
    x=1/6x+1/7x+1/12x+9
    tanx=1.25
    tanx=1/0.8
    3a²＋2a＝1
    80 x=16 x+960
    4xx＝144
    x=1/6+1/12+1/7+1/2x+4
    x（x-2024）=-2023
    ln(8.64/x)=5.40
    ln8.64/x=5.40
    ln（x/8. 64）=5.40
    211*x/24+4.4x=305823.17
    ln（8.64/x）=5.40
    e^x=10001

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